nChannel
or error-control coding is adding redundant bits to detect only or detect and correct errors.
nGoal: Increase the operational range, reduce error probability
or reduce power transmission requirements.
nTypical
gains are in the range of 4-5 dB in SNR for BER and
much better FER gains. Much higher gains are now possible with relatively
little cost than other methods.
nSacrifice: Bit rate and/or complexity.